package com.wangtao.groupchat;


import java.io.IOException;
import java.net.InetSocketAddress;
import java.nio.ByteBuffer;
import java.nio.channels.SelectionKey;
import java.nio.channels.Selector;
import java.nio.channels.SocketChannel;
import java.util.Iterator;
import java.util.Scanner;

public class GroupChatClient {

    private final String HOST = "127.0.0.1";
    private final int PORT = 6667;
    private Selector selector;
    private SocketChannel socketChannel;
    private String username;

    public GroupChatClient() {
        try {
            selector = Selector.open();
            socketChannel = SocketChannel.open(new InetSocketAddress(HOST,PORT));
            socketChannel.configureBlocking(false);
            socketChannel.register(selector, SelectionKey.OP_READ);
            username = socketChannel.getLocalAddress().toString().substring(1);
            System.out.println(username+" is ok...");
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    //向服务器发送消息
    public void sendInfo(String info) {
        try {
            info = username + " 说：" + info;
            socketChannel.write(ByteBuffer.wrap(info.getBytes()));
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    //读取服务器回复的消息
    public void readInfo() {
        try {
            int select = selector.select();
            if (select > 0) {
                Iterator<SelectionKey> iterator = selector.selectedKeys().iterator();
                while (iterator.hasNext()) {
                    SelectionKey key = iterator.next();
                    if (key.isReadable()) {
                        //得到相关的通道
                        SocketChannel sc= (SocketChannel)key.channel();
                        ByteBuffer buffer = ByteBuffer.allocate(1024);
                        sc.read(buffer);
                        String msg = new String(buffer.array());
                        System.out.println(msg.trim());

                    }
                }
                iterator.remove();
            }else{
                //System.out.println("没有可用的通道");
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        GroupChatClient client = new GroupChatClient();

        new Thread(()->{
            while (true) {
                client.readInfo();
                try {
                    Thread.sleep(3000);
                } catch (InterruptedException e) {
                    e.printStackTrace();
                }
            }
        }).start();

        Scanner scanner = new Scanner(System.in);

        while (scanner.hasNextLine()) {
            String s = scanner.nextLine();
            client.sendInfo(s);
        }
    }
}
